Problem is that only a naked motorcycle plate can be placed on it. The two holes at the top of the plate attach OK to the assembly. But then the vertical height adjustment is needed to put the middle lip just below the plate for it to be secured.
All motorcycle chrome or otherwise customized license plate frames (some in the HD accessories catalog) have "4-holes" as do the typical state license plates (California for me).
These two bottom holes are left showing unconnected because the HD designers must have fallen aslept in York, PA when they put it together.
A custom HD logo bolt is 3/4" long and pushes into the lower portion of the plate bracket, and bends the frame/plate.
The only way that looks feasible to attach two bolts at the bottom of a 4-hole license plate frame (for asthetics and completeness) is to drill a hole (actually partial notch for running a 3/4" bolt through the bottom edge of the bracket and then securing it with a locking nut.
You can't see what is buggered behind the lower portion of the bracket, but at least from the outside it looks like a customized (chrome, etc.) license plate frame with 4 HD logo (or simple chrome) bolts attaching the plate securely. There is no use for the vertical piece that only has a lip to secure a plate only, and not the plate mounted behind a typical plate frame.
Confusing?
I am confused by how such an idiot design escaped the HD factory. Everyone puts some kind of frame around the license plate, and HD sells them.
But the 2006 FLHX Street Glide is unable to accomodate any frame attached to the new plate bracket that is positioned below the rear tail light.